diff --git a/src/NetEvolve.Extensions.XUnit/Internal/CultureAttributeBase.cs b/src/NetEvolve.Extensions.XUnit/Internal/CultureAttributeBase.cs
index 383b3d3..76313b4 100644
--- a/src/NetEvolve.Extensions.XUnit/Internal/CultureAttributeBase.cs
+++ b/src/NetEvolve.Extensions.XUnit/Internal/CultureAttributeBase.cs
@@ -10,7 +10,7 @@
 /// Provides basic functionality for culture-based testing.
 /// </summary>
 [AttributeUsage(
-    AttributeTargets.Class | AttributeTargets.Method,
+    AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method,
     AllowMultiple = true,
     Inherited = true
 )]
diff --git a/src/NetEvolve.Extensions.XUnit/SetCultureAttribute.cs b/src/NetEvolve.Extensions.XUnit/SetCultureAttribute.cs
index 7c63355..5d1ad84 100644
--- a/src/NetEvolve.Extensions.XUnit/SetCultureAttribute.cs
+++ b/src/NetEvolve.Extensions.XUnit/SetCultureAttribute.cs
@@ -8,7 +8,10 @@
 /// <summary>
 /// Based on the value passed as culture, the marked test is executed.
 /// </summary>
-[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = false)]
+[AttributeUsage(
+    AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method,
+    Inherited = false
+)]
 public sealed class SetCultureAttribute : CultureAttributeBase
 {
     private readonly CultureInfo _uiCulture;
diff --git a/src/NetEvolve.Extensions.XUnit/SetUICultureAttribute.cs b/src/NetEvolve.Extensions.XUnit/SetUICultureAttribute.cs
index d4f6c27..ddca5d1 100644
--- a/src/NetEvolve.Extensions.XUnit/SetUICultureAttribute.cs
+++ b/src/NetEvolve.Extensions.XUnit/SetUICultureAttribute.cs
@@ -7,7 +7,10 @@
 /// <summary>
 /// Based on the value passed as UI culture, the marked test is executed.
 /// </summary>
-[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = false)]
+[AttributeUsage(
+    AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method,
+    Inherited = false
+)]
 public sealed class SetUICultureAttribute : CultureAttributeBase
 {
     /// <summary>